Adjustable pilot reamer



y 1929. J. KATTREIN ,079

ADJUS'i'ABLE PILOT REAMER I F1156 March 28, 1927 25 I 18- 1f 6 3f 7 v g r ATTORNVEY v cal, durable and reliable in use, and easy: and economical tomanufaoture.

Patented May 7, 1929.

UITED STATES .WILLIAM J. KATTREIN, OF ALBANY, NEW YORK.

ADJUSTABLE PILOT BEAMER.

Ap'p1ication filed March 28, 1927. Serial No. 178,973.

a This invention relates to pilot reamers or alining reamers and more particularly to expansion reamers having self adjusting spring pilots thereon for alining the reamer, as when reaming and aiming worn piston wrist-pin holes, though it is noted that the invention is not limited to reamers for use with spring alining pilots nor in some respects even to pilots. 7

One object of the invention is to provide an expansion-pin actuated reamer having a one-piece body including a suitable forward shank for the reception of a sliding adjustable pilot.

Another object of the invention is to provide a reamer of this kind in which the bore for the expansion pin does not pass through said shank, but passes through the rear tool-receiving end of the body.

Another object of the invention is to pro vide a reamer of this kind in which danger of rupture through over expansion is eliminated.

(lther objects of the invention are to improve generally the simplicity and efficiency of such reamers and to provide a reamer of this kind which is easy to operate, economi- Still other objects of the invention will appear as the description proceeds; and

while herein details of the invention are de scribed and claimed, the invention is not limited to these, since many and various changes may be made without departing from the scope of the invention as claimed in the broader claims. I V The inventive features for the accomplishment of these and other objectsare shown herein in connection with an. improved reamer wl1icl1,briefiy stated, includes a onepiece body provided with a rear tool receivbore extending through said rear part and terminating near the rear of said shank. Said body is intermediately provided with long outwardly expansible cutting flutes, and openings therebetween extending into said bore throughout the major part of the flutes. An expanding pin received in said bore has its motive end at said tool receiving part and has expanding engagement with intermediate parts of said flutes. While various proportions are possible said shank may be about as long as said flutes, about half the diameter of the fluted portion and less than yieldable expanding sections.

twice the diameter of said pin, thereby adapting it for the slidable reception of a pilot having an outside diameter suitably approximating that of the fluted portion.

- In the accompanying drawing, showing by way of example, one of many possible embodiments of the invention,

Fig. 1 is a' side elevation showing the reamer with pilot thereon as in use reaming out the wrist-pin holes of'a piston, the piston being shown in axial section;

Fig. 2 is a longitudinal sectional view, partly in elevation, showing the reamer with the pilot thereon, the section being taken on a slightly twisted plane; and

Fig. 3is a side elevation of the pilot.-

My improved reamer comprises a body portion provided at the rear and motive end with a squared tool receiving head 5. Adj scent to said head is a long cylindrical rear pilot 6, and at the forward end there is a smooth forwardly extended cylindrical shank 7 of uniform diameter about half the diameter of the rear pilot 6.

Said body portion is also provided with an axial bore 10 (F ig. 2) enlarged and threaded, as'at 11, at the motiveend of the reanier'and tapering intermediately, as at 12, toward the leading end and terminating, as at '13, near the rear end of said shank '7.

The intermediate part of said body portion between said shank and rear pilot is providedwith long and spiral flutes 15 provided with forward cutting edges 16. Elongated cuts 17 are provided in the bottom of the groove'between said flutes and extend into said bore 10 throughoutthe length of said flutes and the tapered portion 12, thereby forming elongated slightly outwardly A small portion of'the reamer; atthe ends of theflutes In said bore 10 is disposed an expanding pin 20 having its rear end portion 21 enlarged and in threaded engagement with the threads 11 of said bore and'provided with a flattened tool receiving end 22 projecting to the rear of s'aid squared heads, The forare slightly reduced to form'necks 18 and mg part, a forward long shank and an axial '19 I ward end 23 of said pinis tapered and en- I gages said expanding sections at the tapered portion 12 for forcing the flutes 15 outwardly to adjust the diameter of portion ofthe reamer.

the active Alimiting collar 25 fast 'onthe projecting end 21-of said pin limits the inward movement of the pin to prevent excessive expanding of the reaming portion and breakage of said expanding sections and flutes. On said shank 7 is disposed a pilot 27 serving for guiding said reamer into, or alining the reamer with, a hole of irregular or other cross-section, such for instance as the hole 29 of a piston 30 having the wrist-pin holes 29 and 31, which it is desired to ream out and aline.

Said pilot is here shown as comprising a body portion 33 provided with a bearing bore 34: fitting on said shank 7. A plurality of resilient fingers formed on the inner end of said body portion are spaced from said shank and pointed toward the reamer. The outer face oi said lingers being formed near the free ends of the lingers with beadlike portions 36 respectively engageable with the intermediate part of the interior of the hole 29 for substantially centering the reamer with that part, the intermediate part 37 of the outer face of said fingers being converged, when the fingers are sprung in, to provide a conical portion adapted to wedge in the end of the hole 29 for substan tially centering the hole at said part, whereby by centering the reamer at said two parts 36 and 87, the reamer is substantially alined with the axis of the hole.

In order to accommodate the pilot 27 or other similarly operative pilot, said shank 7 is here shown as being about as long as said flutes 15, about half the diameter of the fluted portion and less than twice the diameter of the pin 20 which makes it enough smaller in diameter than the flutes to receive the expanding pilot 27 slidable on said shank and still leave room for an outside effective diameter approximately that of the fluted portion; but in orc or for the pilot to be practically operative, the shank 7' has to be so small that it would be ditficult and costly to provide a here such as the bore 10 therethrough such as could receive the pin 20 and enlargement 21. It was for a long time thought impossible to use the herein shown type of expanding reainer with the forward shank and spring pilot because of the diliiculty of providing the long forward bore; and it was decided to use this shank and pilot with the interior Critchley type of reamer shown in U. S. Patent No. 51,5 3 of Dec. 19, 1865. The problem was long known and the solution sought, but the solution was long deterred because no one of the inventors and mechanics consulted thought of having the shank 7 free of bore and the pin 20 manipulated from the rear end. 'I he herein invention solves the problem.

The operation of the reamer on piston wrist pin holes is simple and obvious. By means or the flattened end 22 the flutes are set to the required diameter for initial reann ing. The pilot is removed; the shank 7 is inserted through one wrist pin 31 into the hole 80; the pilot is replaced with the beaded end inward, the beaded end initially centering the shank 7, and then the pilot is pressed inward with a wedging fit, the beads 36 engaging near one end of the hole 29, the intermediate part 37 of the lingers engaging the outer end. This alines the reamer with the hole 29, and the hole 31 is then reamed by the reamer in alinement with the hole 29 the shank 7 sliding and turning in the pilot, as the reamer moves toward the hole 29 and commences to ream it. The pilot is then re moved and both holes reamed in alinementwith each other.

Other uses for the reanier, besides spaced apart alined holes, will readily suggest themselves; and as both end portions of the holes are engaged by the bead and intermediate portion of the fingers, the reamer is useful for reaming out single holes which are notto be alined with other holes.

I claim as my invention; 7

1. In a reamer, a one-piece body portion provided with a rear tool receiving head and at the forward end with a long smooth eylindrical shank of constant diameter; said body portion having an intermediately torwardly tapered axial bore extending from, and threaded at, said rear end, and terminating to the rear of said shank; said body portion between said shank and rear head being provided with long cutting flutes and cuts therebetween extending into said bor'e throughout the length of the flutes and said tapered portion; said shank being smaller in diameter than the fluted portion; an expanding pin in threaded engagement with the threads of said bore and provided with a projecting tool-receiving rear end, the for ward end being tapered and engaging the tapered portion of the bore; and an automatically expanding spring pilot guide provided with a bearing bore slidably fitting on said shank. i

2. In a reamer, a one-piece body portion provided with a rear tool receiving head and at the forward end with a long smooth cylindrical shank of constant diameter; said body portion having an intermediately torwardly tapered axial bore extending from, and threaded at, said rear end, and terminating to the rear of said shank; said body portion between said shank and rear head being provided with long cut-ting flutes and cuts therebetween extending into said bore throughout the length of the flutes and said tapered portion; said shank being smaller in diameter than the fluted portion; an expanding pin in threaded engagement with the threads of said bore and provided with a projecting tool-receiving rear end, the for ward endbeing tapered and engaging the tapered portion of the bore; and a pilot guide provided with a bearing bore slidably fitting on said shank.

3. In a reamer, a body portion provided with a rear tool receiving head, a long cylindrical rear pilot adjacent to said head and at the forward end with a long smooth cylindrical shank of constant diameter; said body portion having an intermediately forwardly tapered axial bore extending from, and threaded at, said rear end, and terminating to the rear of said shank; said body portion between said shank and rear pilot being provided with long cutting flutes and cuts therebetween extending into said bore throughout the length of the flutes and said tapered portion; the fluted portion being substantially the diameter of the rear pilot, and said shank being smaller in diameter than the rear pilot and the fluted portion and less than twice the diameter of said bore; an expanding pin in threaded engagement with the threads of said bore and provided with a projecting tool receiving end, the forward end tapered and engaging the tapered portion of the bore; and a pilot slidable on the shank.

l. In a reamer, a body portion provided with a rear tool receiving head, and at the forward end with a long smoothcylindrical shank of constant diameter; said body portion having an inter'mediately forwardly tapered axial bore extending from, and threaded at, the rear end, and terminating just to the rear of the shank; said body portion between said shank and rear head being provided with long cutting flutes andcuts therebetween extending into said bore 7 throughout the length of the flutes and tapered portion; said shank being smaller in diameter than the fluted portion and less than twice the diameter 01 said here; an expanding pin in threaded engagement with the threads of said bore and provided with a rearwardly projecting tool receiving end, the forward end being tapered and engaging the tapered portion of the bore; and an automatically expanding spring pilot guide comprising a body portion provided with a bearing bore slidably fitting on said shank, and spring fingers formed on the inner end of said body portion and spaced from said shank and pointing toward the reainer, the

free ends of said fingers being formed with and threaded at, said rear end, and terminating to the rear of said shank; said body portion between said shank and rear pilot being provided with long cutting flutes and cuts therebetween extending into said bore throughout the length of the flutes and said tapered portion; said shank being smaller in diameter than the rear pilot and the fluted portion and less than twice the diameter of said bore; an expanding pin in threaded engagement with the threads of'said bore and provided with a projecting threaded and flattened tool receiving end, the forward end tapered and engaging the tapered portion of the bore; a collar fast on the projecting threaded end of said pin for limiting inward movement of the pin and excessive expanding of the flutes; and a pilot slidably snugly fitting on said shank.

Signed at Albany, in the county of Albany and State of New York, this 21st day of March, A. D. 1927.

WILLIAM J. KATTREIN. 

